【作者】 刘东； 李丽波； 由天艳；

【Author】 Dong Liu;Libo Li;Tianyan You;Key Laboratory of Modern Agriculture Equipment and Technology, Jiangsu University;

【机构】 江苏大学农业装备工程学院；

【摘要】 基于其优异的催化活性,铂基纳米材料被广泛用于多种重要反应的催化,例如燃料电池研究中涉及的氧气还原反应、甲醇氧化反应以及氢气析出反应等。由于贵金属铂有限的储量以及高昂的成本问题,提高贵金属铂的利用率与铂基纳米材料的催化性能成为这类催化剂研究的重要课题。利用甲酸作为还原剂,我们发展了一种室温条件下实现铂纳米粒子负载氮掺杂石墨烯复合材料（Pt/NG）简单、高效制备的新方法,并进一步将其应用于电化学催化甲醇氧化反应的研究。与商业化的铂碳催化剂（Pt/C）相比,我们制备的Pt/NG复合材料对甲醇氧化反应的电催化活性与稳定性均有显著提高。催化活性测试结果显示,Pt/NG表面的峰电流密度达到25.9 mA cm^-2,远高于Pt/C(5.7 mA cm^-2));同时,经过50圈连续扫描后,Pt/NG的峰电流密度降低33%,而Pt/C的峰电流密度降低了84%,显示了前者优异的催化稳定性。更多还原

【Abstract】 Platinum based materials have been widely investigated for the excellent catalytic activity for numbers of reactions, such as oxidation of fuel molecules（methanol, ethanol） [1, 2], oxygen reduction reaction（ORR） [3], and hydrogen reduction reaction（HER） [4], which are of vital importance in fuel cells. However, the large-scale applications have seriously hindered by the high-cost and limited reserve of Pt. Thus, extensively efforts have been devoted to the improvement of efficient utilization of Pt in these catalytic processes. Herein, we develop a novel platinum nanoparticles loaded nitrogen-doped graphene（Pt/NG） as the high-performance catalyst for methanol oxidation reaction（MOR） by a simple method using formic acid as reduction agent under the room temperature. For Pt/NG, Pt NPs shows a more uniform dispersion on nitrogen doped graphene with a higher Pt loading. Compared with commercial Pt/C, the resultant Pt/NG displays a larger peak current density of 25.9 mA cm^-2 for MOR. The forward peak current densities retains c.a. 67 % and 16 % on Pt/NG, Pt/C after 50 cycles, respectively. The Pt/NG with high catalytic properties and cost-effective may emerge as a novel high-performance catalyst in fuel cells.更多还原